Lamp



FIG. 1 is a perspective view from the front and one side of a lamp showing my new design;

FIG. 2 is a perspective view from the rear and other side thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a side elevational view thereof. 

The ornamental design for a lamp, as shown. 